函数传参-操作多组图片切换

HTML

<div class="box">
	<div>
		<a href="javascript:;">上一组</a>
		<a href="javascript:;">下一组</a>
	</div>
	<ul class="clearFix">
		<li class="fl">
			<img src=""/>
			<p>
				<span></span>
				<i></i>
			</p>
		</li>
		<li class="fl">
			<img src=""/>
			<p>
				<span></span>
				<i></i>
			</p>
		</li>
	</ul>
</div>

CSS

*{
	margin: 0;
	padding: 0;
}
.fl{
	float: left;
}
.fr{
	float: right;
}
.clearFix:after{
	display: block;
	content: "";
	clear: both;
}
.box{
	 500px;
	margin: 50px auto 0;
}
a{
	display: inline-block;
	 100px;
	height: 30px;
	text-align: center;
	line-height: 30px;
	border: 1px solid #000;
	border-radius: 5px;
	text-decoration: none;
	color: #000;
	font-size: 14px;
	margin-bottom: 10px;
}
ul{
	 620px;
	list-style: none;
}
img{
	 300px;
	height: 150px;
}
li:nth-of-type(2){
	margin-left: 20px;
}
span{
	display: block;
	text-align: center;
}

JS

var imgArry=[
	["https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510739103582&di=0939369c1f3121bd67302a3b1c9f6f75&imgtype=0&src=http%3A%2F%2Fwww.czxnews.com%2Fczxnews%2Fd%2Ffile%2Fsheying%2Fyishusheying%2F2013-12-23%2Fe15396e02562a0bb6bde8e9984e5a9ad.jpg",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1511335272&di=b124fecf6508ca88fcf57dd515290a67&imgtype=jpg&er=1&src=http%3A%2F%2Fimage13-c.poco.cn%2Fmypoco%2Fmyphoto%2F20121003%2F08%2F6428479620121003083711096.jpg%3F850x566_120",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510740570491&di=5864fb7421f48cf482ac36ff8dc20843&imgtype=0&src=http%3A%2F%2Fimage142-c.poco.cn%2Fmypoco%2Fmyphoto%2F20130704%2F15%2F6424550520130704151232085.jpg%3F1024x768_120",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510740617529&di=551b393c9a11164bb971a09741ae399e&imgtype=0&src=http%3A%2F%2Fuploads.xuexila.com%2Fallimg%2F1704%2F1047-1F42GHK2.jpg",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510740642624&di=f12767f2a0c7c722117ece5feaa14a1a&imgtype=0&src=http%3A%2F%2Fimage16-c.poco.cn%2Fmypoco%2Fmyphoto%2F20140706%2F19%2F174239703201407061931272517175060562_004.jpg%3F1280x867_120"
	],
	["https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510739214065&di=f3850f19a7097d82f63d8ace1c3fd948&imgtype=0&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F01fe4b5899446aa8012060c82d9622.jpg%401280w_1l_2o_100sh.jpg",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510740715080&di=97281f98ca5f43c06754b0a374c29133&imgtype=0&src=http%3A%2F%2Fwww.iarch.cn%2Fdata%2Fattachment%2Fforum%2Fthreadcover%2Fc6%2F52%2F34299.jpg",
	"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510740736218&di=c4c2cd55466f8a5886459e9420a38741&imgtype=0&src=http%3A%2F%2Fimage16-c.poco.cn%2Fmypoco%2Fmyphoto%2F20140826%2F22%2F445423072014082622175401.jpg%3F1024x470_120"
	]
]
var txtArry=[
	["图片一","图片二","图片三","图片四","图片五"],
	["图片一","图片二","图片三"]
]
var aImg=document.getElementsByTagName("img");
var aSpan=document.getElementsByTagName("span");
var aI=document.getElementsByTagName("i");
var aBtn=document.getElementsByTagName("a");


for (var i=0;i<aImg.length;i++) {
	//页面初始化
	fn(0,i);
	
	//点击图片进行切换
	aImg[i].num=0;
	aImg[i].index=i;
	aImg[i].onclick=function(){
		this.num++;
		fn(this.num,this.index);
	}
}

//点击按钮成组切换
//点击下一组
aBtn[1].onclick=function(){
	for (var i=0;i<aImg.length;i++) {
		aImg[i].num++;
		fn(aImg[i].num,i);
	}
}
//点击上一组
aBtn[0].onclick=function(){
	for (var i=0;i<aImg.length;i++) {
		aImg[i].num--;
		if(aImg[i].num<0){
			aImg[i].num=imgArry[i].length-1;
		}
		fn(aImg[i].num,i);
	}
}

//封装方法
function fn(num,index){
	num%=imgArry[index].length;
	aImg[index].src=imgArry[index][num];
	aSpan[index].innerHTML=txtArry[index][num];
	aI[index].innerHTML=num+1+"/"+imgArry[index].length;
}